diff --git a/artiq/gateware/rtio/core.py b/artiq/gateware/rtio/core.py
index 5ad5f6591..6b19c52dd 100644
--- a/artiq/gateware/rtio/core.py
+++ b/artiq/gateware/rtio/core.py
@@ -102,3 +102,4 @@ class Core(Module, AutoCSR):
             quash_channels=quash_channels,
             interface=self.cri)
         self.submodules += inputs
+        self.comb += inputs.coarse_timestamp.eq(coarse_ts)